# skfolio.utils.stats.n_bins_knuth ### skfolio.utils.stats.n_bins_knuth(x) Compute the optimal histogram bin size using Knuth’s rule [[1]](#r8c3fe88ee915-1). * **Parameters:** **x** *ndarray of shape (n_observations,)* : The input array. * **Returns:** **n_bins** *int* : The optimal bin size. ### References * **[1]** “Optimal Data-Based Binning for Histograms”. Knuth.